finding remote mac

[talktorishav () hotmail com]

Hello all,I have a strange problem here. I have got computer A, which has two NIC. One nic is for internet and the 
other for local LAN. the internet in the computer A is through PPOE. I am browsing internet form computer B. I know the 
ip and MAC of the second nic connected to LAN of computer A by simply looking at the arp cache. I want to know the MAC 
of the first NIC of compuer A which is connected to the internet cable. The first nic might not have any IP as we dont 
need to give IP to connect to the internet via ppoe.
 How can i achieve that??

rishav upadhya.

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